<template>
    <u-popup v-model="value" :border-radius="borderRadius" :closeable="closeable" :maskCloseAble="maskCloseAble"
             :popup="false" :safeAreaInsetBottom="safeAreaInsetBottom"
             :z-index="uZIndex" closeable length="auto" mode="bottom"
             @close="close">
        <view class="u-calendar">
            <view class="u-calendar__header">
                <view v-if="!$slots['tooltip']" class="u-calendar__header__text">
                    {{ toolTip }}
                </view>
                <slot v-else name="tooltip"/>
            </view>
            <view class="u-calendar__action u-flex u-row-center">
                <view class="u-calendar__action__icon">
                    <u-icon v-if="changeYear" :color="yearArrowColor" name="arrow-left-double"
                            @click="changeYearHandler(0)"></u-icon>
                </view>
                <view class="u-calendar__action__icon">
                    <u-icon v-if="changeMonth" :color="monthArrowColor" name="arrow-left"
                            @click="changeMonthHandler(0)"></u-icon>
                </view>
                <view class="u-calendar__action__text">{{ showTitle }}</view>
                <view class="u-calendar__action__icon">
                    <u-icon v-if="changeMonth" :color="monthArrowColor" name="arrow-right"
                            @click="changeMonthHandler(1)"></u-icon>
                </view>
                <view class="u-calendar__action__icon">
                    <u-icon v-if="changeYear" :color="yearArrowColor" name="arrow-right-double"
                            @click="changeYearHandler(1)"></u-icon>
                </view>
            </view>
            <view class="u-calendar__week-day">
                <view v-for="(item, index) in weekDayZh" :key="index" class="u-calendar__week-day__text">{{ item }}
                </view>
            </view>
            <view class="u-calendar__content">
                <!-- 前置空白部分 -->
                <block v-for="(item, index) in weekdayArr" :key="index">
                    <view class="u-calendar__content__item"></view>
                </block>
                <view v-for="(item, index) in daysArr" :key="index" :class="{
					'u-hover-class':openDisAbled(year,month,index+1),
					'u-calendar__content--start-date': (mode == 'range' && startDate==`${year}-${month}-${index+1}`) || mode== 'date',
					'u-calendar__content--end-date':(mode== 'range' && endDate==`${year}-${month}-${index+1}`) || mode == 'date'
				}" :style="{backgroundColor: getColor(index,1)}" class="u-calendar__content__item"
                      @tap="dateClick(index)">
                    <view :style="{color: getColor(index,2)}" class="u-calendar__content__item__inner">
                        <view>{{ index + 1 }}</view>
                    </view>
                    <view v-if="mode== 'range' && startDate==`${year}-${month}-${index+1}` && startDate!=endDate"
                          :style="{color:activeColor}"
                          class="u-calendar__content__item__tips">
                        {{ startText }}
                    </view>
                    <view v-if="mode== 'range' && endDate==`${year}-${month}-${index+1}`" :style="{color:activeColor}"
                          class="u-calendar__content__item__tips">{{ endText }}
                    </view>
                </view>
                <view class="u-calendar__content__bg-month">{{ month }}</view>
            </view>
            <view class="u-calendar__bottom">
                <view class="u-calendar__bottom__choose">
                    <text>{{ mode == 'date' ? activeDate : startDate }}</text>
                    <text v-if="endDate">至{{ endDate }}</text>
                </view>
                <view class="u-calendar__bottom__btn">
                    <u-button :type="btnType" shape="circle" size="default" @click="btnFix(false)">确定</u-button>
                </view>
            </view>
        </view>
    </u-popup>
</template>
<script>
/**
 * calendar 日历
 * @description 此组件用于单个选择日期，范围选择日期等，日历被包裹在底部弹起的容器中。
 * @tutorial http://uviewui.com/components/calendar.html
 * @property {String} mode 选择日期的模式，date-为单个日期，range-为选择日期范围
 * @property {Boolean} v-model 布尔值变量，用于控制日历的弹出与收起
 * @property {Boolean} safe-area-inset-bottom 是否开启底部安全区适配(默认false)
 * @property {Boolean} change-year 是否显示顶部的切换年份方向的按钮(默认true)
 * @property {Boolean} change-month 是否显示顶部的切换月份方向的按钮(默认true)
 * @property {String Number} max-year 可切换的最大年份(默认2050)
 * @property {String Number} min-year 最小可选日期(默认1950)
 * @property {String Number} min-date 可切换的最小年份(默认1950-01-01)
 * @property {String Number} max-date 最大可选日期(默认当前日期)
 * @property {String Number} 弹窗顶部左右两边的圆角值，单位rpx(默认20)
 * @property {Boolean} mask-close-able 是否允许通过点击遮罩关闭日历(默认true)
 * @property {String} month-arrow-color 月份切换按钮箭头颜色(默认#606266)
 * @property {String} year-arrow-color 年份切换按钮箭头颜色(默认#909399)
 * @property {String} color 日期字体的默认颜色(默认#303133)
 * @property {String} active-bg-color 起始/结束日期按钮的背景色(默认#2979ff)
 * @property {String Number} z-index 弹出时的z-index值(默认10075)
 * @property {String} active-color 起始/结束日期按钮的字体颜色(默认#ffffff)
 * @property {String} range-bg-color 起始/结束日期之间的区域的背景颜色(默认rgba(41,121,255,0.13))
 * @property {String} range-color 选择范围内字体颜色(默认#2979ff)
 * @property {String} start-text 起始日期底部的提示文字(默认 '开始')
 * @property {String} end-text 结束日期底部的提示文字(默认 '结束')
 * @property {String} btn-type 底部确定按钮的主题(默认 'primary')
 * @property {String} toolTip 顶部提示文字，如设置名为tooltip的slot，此参数将失效(默认 '选择日期')
 * @property {Boolean} closeable 是否显示右上角的关闭图标(默认true)
 * @example <u-calendar v-model="show" :mode="mode"></u-calendar>
 */

export default {
    name: 'u-calendar',
    props: {
        safeAreaInsetBottom: {
            type: Boolean,
            default: false
        },
        // 是否允许通过点击遮罩关闭Picker
        maskCloseAble: {
            type: Boolean,
            default: true
        },
        // 通过双向绑定控制组件的弹出与收起
        value: {
            type: Boolean,
            default: false
        },
        // 弹出的z-index值
        zIndex: {
            type: [String, Number],
            default: 0
        },
        // 是否允许切换年份
        changeYear: {
            type: Boolean,
            default: true
        },
        // 是否允许切换月份
        changeMonth: {
            type: Boolean,
            default: true
        },
        // date-单个日期选择，range-开始日期+结束日期选择
        mode: {
            type: String,
            default: 'date'
        },
        // 可切换的最大年份
        maxYear: {
            type: [Number, String],
            default: 2050
        },
        // 可切换的最小年份
        minYear: {
            type: [Number, String],
            default: 1950
        },
        // 最小可选日期(不在范围内日期禁用不可选)
        minDate: {
            type: [Number, String],
            default: '1950-01-01'
        },
        /**
         * 最大可选日期
         * 默认最大值为今天，之后的日期不可选
         * 2030-12-31
         * */
        maxDate: {
            type: [Number, String],
            default: ''
        },
        // 弹窗顶部左右两边的圆角值
        borderRadius: {
            type: [String, Number],
            default: 20
        },
        // 月份切换按钮箭头颜色
        monthArrowColor: {
            type: String,
            default: '#606266'
        },
        // 年份切换按钮箭头颜色
        yearArrowColor: {
            type: String,
            default: '#909399'
        },
        // 默认日期字体颜色
        color: {
            type: String,
            default: '#303133'
        },
        // 选中|起始结束日期背景色
        activeBgColor: {
            type: String,
            default: '#2979ff'
        },
        // 选中|起始结束日期字体颜色
        activeColor: {
            type: String,
            default: '#ffffff'
        },
        // 范围内日期背景色
        rangeBgColor: {
            type: String,
            default: 'rgba(41,121,255,0.13)'
        },
        // 范围内日期字体颜色
        rangeColor: {
            type: String,
            default: '#2979ff'
        },
        // mode=range时生效，起始日期自定义文案
        startText: {
            type: String,
            default: '开始'
        },
        // mode=range时生效，结束日期自定义文案
        endText: {
            type: String,
            default: '结束'
        },
        //按钮样式类型
        btnType: {
            type: String,
            default: 'primary'
        },
        // 当前选中日期带选中效果
        isActiveCurrent: {
            type: Boolean,
            default: true
        },
        // 切换年月是否触发事件 mode=date时生效
        isChange: {
            type: Boolean,
            default: false
        },
        // 是否显示右上角的关闭图标
        closeable: {
            type: Boolean,
            default: true
        },
        // 顶部的提示文字
        toolTip: {
            type: String,
            default: '选择日期'
        }
    },
    data() {
        return {
            // 星期几,值为1-7
            weekday: 1,
            weekdayArr: [],
            // 当前月有多少天
            days: 0,
            daysArr: [],
            showTitle: '',
            year: 2020,
            month: 0,
            day: 0,
            startYear: 0,
            startMonth: 0,
            startDay: 0,
            endYear: 0,
            endMonth: 0,
            endDay: 0,
            today: '',
            activeDate: '',
            startDate: '',
            endDate: '',
            isStart: true,
            min: null,
            max: null,
            weekDayZh: ['日', '一', '二', '三', '四', '五', '六']
        };
    },
    computed: {
        dataChange() {
            return `${this.mode}-${this.minDate}-${this.maxDate}`;
        },
        uZIndex() {
            // 如果用户有传递z-index值，优先使用
            return this.zIndex ? this.zIndex : this.$u.zIndex.popup;
        }
    },
    watch: {
        dataChange(val) {
            this.init()
        }
    },
    created() {
        this.init()
    },
    methods: {
        getColor(index, type) {
            let color = type == 1 ? '' : this.color;
            let day = index + 1
            let date = `${this.year}-${this.month}-${day}`
            let timestamp = new Date(date.replace(/\-/g, '/')).getTime();
            let start = this.startDate.replace(/\-/g, '/')
            let end = this.endDate.replace(/\-/g, '/')
            if ((this.isActiveCurrent && this.activeDate == date) || this.startDate == date || this.endDate == date) {
                color = type == 1 ? this.activeBgColor : this.activeColor;
            } else if (this.endDate && timestamp > new Date(start).getTime() && timestamp < new Date(end).getTime()) {
                color = type == 1 ? this.rangeBgColor : this.rangeColor;
            }
            return color;
        },
        init() {
            let now = new Date();
            this.year = now.getFullYear();
            this.month = now.getMonth() + 1;
            this.day = now.getDate();
            this.today = `${now.getFullYear()}-${now.getMonth() + 1}-${now.getDate()}`;
            this.activeDate = this.today;
            this.min = this.initDate(this.minDate);
            this.max = this.initDate(this.maxDate || this.today);
            this.startDate = "";
            this.startYear = 0;
            this.startMonth = 0;
            this.startDay = 0;
            this.endYear = 0;
            this.endMonth = 0;
            this.endDay = 0;
            this.endDate = "";
            this.isStart = true;
            this.changeData();
        },
        //日期处理
        initDate(date) {
            let fdate = date.split('-');
            return {
                year: Number(fdate[0] || 1920),
                month: Number(fdate[1] || 1),
                day: Number(fdate[2] || 1)
            }
        },
        openDisAbled: function (year, month, day) {
            let bool = true;
            let date = `${year}/${month}/${day}`;
            // let today = this.today.replace(/\-/g, '/');
            let min = `${this.min.year}/${this.min.month}/${this.min.day}`;
            let max = `${this.max.year}/${this.max.month}/${this.max.day}`;
            let timestamp = new Date(date).getTime();
            if (timestamp >= new Date(min).getTime() && timestamp <= new Date(max).getTime()) {
                bool = false;
            }
            return bool;
        },
        generateArray: function (start, end) {
            return Array.from(new Array(end + 1).keys()).slice(start);
        },
        formatNum: function (num) {
            return num < 10 ? '0' + num : num + '';
        },
        //一个月有多少天
        getMonthDay(year, month) {
            let days = new Date(year, month, 0).getDate();
            return days;
        },
        getWeekday(year, month) {
            let date = new Date(`${year}/${month}/01 00:00:00`);
            return date.getDay();
        },
        checkRange(year) {
            let overstep = false;
            if (year < this.minYear || year > this.maxYear) {
                uni.showToast({
                    title: "日期超出范围啦~",
                    icon: 'none'
                })
                overstep = true;
            }
            return overstep;
        },
        changeMonthHandler(isAdd) {
            if (isAdd) {
                let month = this.month + 1;
                let year = month > 12 ? this.year + 1 : this.year;
                if (!this.checkRange(year)) {
                    this.month = month > 12 ? 1 : month;
                    this.year = year;
                    this.changeData();
                }

            } else {
                let month = this.month - 1;
                let year = month < 1 ? this.year - 1 : this.year;
                if (!this.checkRange(year)) {
                    this.month = month < 1 ? 12 : month;
                    this.year = year;
                    this.changeData();
                }
            }
        },
        changeYearHandler(isAdd) {
            let year = isAdd ? this.year + 1 : this.year - 1;
            if (!this.checkRange(year)) {
                this.year = year;
                this.changeData();
            }
        },
        changeData() {
            this.days = this.getMonthDay(this.year, this.month);
            this.daysArr = this.generateArray(1, this.days)
            this.weekday = this.getWeekday(this.year, this.month);
            this.weekdayArr = this.generateArray(1, this.weekday)
            this.showTitle = `${this.year}年${this.month}月`;
            if (this.isChange && this.mode == 'date') {
                this.btnFix(true);
            }
        },
        dateClick: function (day) {
            day += 1;
            if (!this.openDisAbled(this.year, this.month, day)) {
                this.day = day;
                let date = `${this.year}-${this.month}-${day}`;
                if (this.mode == 'date') {
                    this.activeDate = date;
                } else {
                    let compare = new Date(date.replace(/\-/g, '/')).getTime() < new Date(this.startDate.replace(/\-/g, '/')).getTime()
                    if (this.isStart || compare) {
                        this.startDate = date;
                        this.startYear = this.year;
                        this.startMonth = this.month;
                        this.startDay = this.day;
                        this.endYear = 0;
                        this.endMonth = 0;
                        this.endDay = 0;
                        this.endDate = "";
                        this.activeDate = "";
                        this.isStart = false;
                    } else {
                        this.endDate = date;
                        this.endYear = this.year;
                        this.endMonth = this.month;
                        this.endDay = this.day;
                        this.isStart = true;
                    }
                }
            }
        },
        close() {
            // 修改通过v-model绑定的父组件变量的值为false，从而隐藏日历弹窗
            this.$emit('input', false);
        },
        getWeekText(date) {
            date = new Date(`${date.replace(/\-/g, '/')} 00:00:00`);
            let week = date.getDay();
            return '星期' + ['日', '一', '二', '三', '四', '五', '六'][week];
        },
        btnFix(show) {
            if (!show) {
                this.close();
            }
            if (this.mode == 'date') {
                let arr = this.activeDate.split('-')
                let year = this.isChange ? this.year : Number(arr[0]);
                let month = this.isChange ? this.month : Number(arr[1]);
                let day = this.isChange ? this.day : Number(arr[2]);
                //当前月有多少天
                let days = this.getMonthDay(year, month);
                let result = `${year}-${this.formatNum(month)}-${this.formatNum(day)}`;
                let weekText = this.getWeekText(result);
                let isToday = false;
                if (`${year}-${month}-${day}` == this.today) {
                    //今天
                    isToday = true;
                }
                this.$emit('change', {
                    year: year,
                    month: month,
                    day: day,
                    days: days,
                    result: result,
                    week: weekText,
                    isToday: isToday,
                    // switch: show //是否是切换年月操作
                });
            } else {
                if (!this.startDate || !this.endDate) return;
                let startMonth = this.formatNum(this.startMonth);
                let startDay = this.formatNum(this.startDay);
                let startDate = `${this.startYear}-${startMonth}-${startDay}`;
                let startWeek = this.getWeekText(startDate)

                let endMonth = this.formatNum(this.endMonth);
                let endDay = this.formatNum(this.endDay);
                let endDate = `${this.endYear}-${endMonth}-${endDay}`;
                let endWeek = this.getWeekText(endDate);
                this.$emit('change', {
                    startYear: this.startYear,
                    startMonth: this.startMonth,
                    startDay: this.startDay,
                    startDate: startDate,
                    startWeek: startWeek,
                    endYear: this.endYear,
                    endMonth: this.endMonth,
                    endDay: this.endDay,
                    endDate: endDate,
                    endWeek: endWeek
                });
            }
        }
    }
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";

.u-calendar {
    color: $u-content-color;

    &__header {
        width: 100%;
        box-sizing: border-box;
        font-size: 30 rpx;
        background-color: #fff;
        color: $u-main-color;

        &__text {
            margin-top: 30 rpx;
            padding: 0 60 rpx;
            @include vue-flex;
            justify-content: center;
            align-items: center;
        }
    }

    &__action {
        padding: 40 rpx 0 40 rpx 0;

        &__icon {
            margin: 0 16 rpx;
        }

        &__text {
            padding: 0 16 rpx;
            color: $u-main-color;
            font-size: 32 rpx;
            line-height: 32 rpx;
            font-weight: bold;
        }
    }

    &__week-day {
        @include vue-flex;
        align-items: center;
        justify-content: center;
        padding: 6px 0;
        overflow: hidden;

        &__text {
            flex: 1;
            text-align: center;
        }
    }

    &__content {
        width: 100%;
        @include vue-flex;
        flex-wrap: wrap;
        padding: 6px 0;
        box-sizing: border-box;
        background-color: #fff;
        position: relative;

        &--end-date {
            border-top-right-radius: 8 rpx;
            border-bottom-right-radius: 8 rpx;
        }

        &--start-date {
            border-top-left-radius: 8 rpx;
            border-bottom-left-radius: 8 rpx;
        }

        &__item {
            width: 14.2857%;
            @include vue-flex;
            align-items: center;
            justify-content: center;
            padding: 6px 0;
            overflow: hidden;
            position: relative;
            z-index: 2;

            &__inner {
                height: 84 rpx;
                @include vue-flex;
                align-items: center;
                justify-content: center;
                flex-direction: column;
                font-size: 32 rpx;
                position: relative;
                border-radius: 50%;

                &__desc {
                    width: 100%;
                    font-size: 24 rpx;
                    line-height: 24 rpx;
                    transform: scale(0.75);
                    transform-origin: center center;
                    position: absolute;
                    left: 0;
                    text-align: center;
                    bottom: 2 rpx;
                }
            }

            &__tips {
                width: 100%;
                font-size: 24 rpx;
                line-height: 24 rpx;
                position: absolute;
                left: 0;
                transform: scale(0.8);
                transform-origin: center center;
                text-align: center;
                bottom: 8 rpx;
                z-index: 2;
            }
        }

        &__bg-month {
            position: absolute;
            font-size: 130px;
            line-height: 130px;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            color: #e4e7ed;
            z-index: 1;
        }
    }

    &__bottom {
        width: 100%;
        @include vue-flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        background-color: #fff;
        padding: 0 40 rpx 30 rpx;
        box-sizing: border-box;
        font-size: 24 rpx;
        color: $u-tips-color;

        &__choose {
            height: 50 rpx;
        }

        &__btn {
            width: 100%;
        }
    }
}
</style>
